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parser.js
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139 lines (120 loc) · 3.58 KB
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class Parser {
/**
* Creates an instance of Parser.
* @param {String} text The text to parse
* @param {Function} afterCmdCallback Function to execute after the commands are executed
* @memberof Parser
*/
constructor(text, afterCmdCallback,offset = 0) {
if (!text) text = '';
this.text = text.trimRight();
this.index = 0;
this.afterCmdCallback = afterCmdCallback
this.offset = offset;
}
/**
* Private method
*
* @returns Boolean If the index has surpased the length of the text or not.
* @memberof Parser
*/
remainingTokens() {
return this.index < this.text.length;
}
/**
* Private method
*
* @returns String The next token after the actual index.
* @memberof Parser
*/
nextToken() {
let regWhitespace = /\s/;
while (regWhitespace.test(this.text.charAt(this.index)) && this.remainingTokens()) this.index++;
let firstChar = this.text.charAt(this.index);
let token = '';
let isTokenList = false;
let depth = 0;
if (firstChar === '[') {
this.index++;
depth++;
isTokenList = true;
}
let actualChar = this.text.charAt(this.index);
while (((regWhitespace.test(actualChar) && isTokenList) || !regWhitespace.test(actualChar)) && this.remainingTokens()) {
this.index++;
if (isTokenList) {
if (actualChar === '[') depth++;
else if (actualChar === ']') depth--;
if (actualChar === ']' && depth === 0) return token;
}
token += actualChar;
actualChar = this.text.charAt(this.index);
}
return token;
}
getArgs() {
let ret = this.nextToken();
let temp = this.index;
let next = this.nextToken();
if (next == '/' || next == '*' || next == '+' || next == '-') {
return ret + ' ' + next + ' ' + this.getArgs();
}
else {
this.index = temp;
return ret;
}
}
/**
* Public method
*
* @returns [CommandExecutor] Parsed text converted into CommandExecutors
* ready to be executed.
* @memberof Parser
*/
parse() {
let cmdsExecutors = [];
while (this.remainingTokens()) {
let cmdStrat = this.index;
let token = this.nextToken();
let cmd = commandLookUp.get(token);
let args = [];
if (cmd) {
for (let i = 0; i < cmd.argsTemplate.length; i++) {
let startIndex = this.index;
let arg = cmd.argsTemplate[i];
let theArgToken = this.getArgs();
let endIndex = this.index + 1;
if (arg.validator !== undefined) {
let valid;
if(arg.type == ARGUMENT_TYPES.COMMANDS)
{
while(this.text.length>startIndex && this.text[startIndex++]!='[');
console.log({arg:theArgToken,offset:startIndex});
valid = arg.validator(theArgToken,startIndex+this.offset)
}else
valid = arg.validator(theArgToken);
if (!valid) {
console.error(`Argument number ${i} (${theArgToken}) is invalid for command ${token} parser offset ${this.offset}`);
throw {
startIndex: startIndex+this.offset,
endIndex: endIndex+this.offset
}
}
args.push(theArgToken);
}
else {
args.push(theArgToken);
}
}
cmdsExecutors.push(new CommandExecutor(cmd, args, this.afterCmdCallback));
}else {
let endIndex = this.index + 1;
throw {
startIndex: cmdStrat+this.offset,
endIndex: endIndex+this.offset
}
}
}
return cmdsExecutors;
}
}